Studio Technologies IFB Plus 2001 - Manual (Page 12)

Issue 7, November 2001 Model 2 User Guide
Page 12 Studio Technologies, Inc.
The Model 33 is unique in that a “mix” of
IFB channels 1 and 2 can be created. Two
level controls, along with a source select
switch, allows camera and production
personnel to hear IFB cues from either
or both channels. This allows IFB signals
intended for both technician and talent
to be simultaneously monitored.
Installation
In this section you will be installing a
Model 2 Central Controller in an equip-
ment rack. In conjunction with the Model
2, up to four Model 22 Access Stations
can be installed. In addition, wiring can
be installed for up to four Model 32 and
33 Talent Amplifiers.
Internally, the Model 2 has no configura-
tion switches or trim pots to set. However,
there are several reasons why you may
need to access the “guts” of the unit:
• The factory-selected AC mains voltage
will be either 120 or 220/240V, depend-
ing on the shipping destination. It may
need to be revised for your installation.
• From the factory, the Model 2 is set to
mute program audio when an interrupt
takes place. If desired, a program “dim”
function, rather than mute function, can
be implemented.
• The standard audio routing for each of
the two IFB channels is for the interrupt
audio to be processed by the compres-
sor/limiter circuits. Program audio, with
its dynamic range unmodified, is sent
directly to the output circuitry. For
special applications, the program audio
flow can be changed so that it too is
routed through the compressor/limiters.
Refer to the Technical Notes section for
details on revising these conditions.
In addition to the above situations, you
may want to take a look inside and famil-
iarize yourself with the unit on the rare
occasion that it may need service. (The
people here in the marketing department
taught us never to say a unit may need to
be fixed—service is much nicer!) We are
proud of how the “guts” of the Model 2
look and how it is constructed so we
encourage you to take a look!
On a more serious side, removing the
Model 2’s cover with the AC mains cord
connected exposes you to hazardous
voltages.
Warning: Never remove the cover
without disconnecting mains power.
We make the assumption that anyone
gaining access to the inside of our
products meets the requirements for
“qualified service personnel”—includ-
ing knowledge of safety precautions.
Locating the Unit
Physical access and mechanical noise
are the primary factors when choosing
a mounting location. You don’t want
a cooling fan blowing directly onto the
internal microphone, nor do you want the
microphone at the level of your navel. It
is also a good idea to keep the Model 2
physically separated from other electronic
devices that produce strong electrical
fields. As a device that contains high gain
audio stages, hum and noise pickup is
possible through the chassis and associ-
ated cabling. Locating the unit away from
devices such as power amplifiers, power
transformers, and lighting controls will
help to avoid pickup of unwanted signals.